Welt sewing machine



Dec. 22, 1931. A. F. cARLsoN 1,837,756

WELT SEWING MACHINE Filed March 51, 1928 2 Sheets-Sheet. 1

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Dec. 22, 1931. A. F. CARLSON IELT SEWING MACHINE Filed Ma rch 51, 1928 2 Sheets-Sheet- 2 A 3 MU\\\\\ m m \nvenTor AxeI F. Cuflson 8' ATYS. p

Patented Dec. 22, 1931 UNITED STATES wEL'rvrnoninn which the upper of a boot orfshoe isstitched to the lip of the insole and to the welt strip.

Machines of this type are exemplified by the J. R. Oliver Patents No. 1,599,431 of September 14, 1926, No. 1,712,517- of May 14, 1929 and No. 1,77 0,992 of July 22, 1930, and the earlierpatents mentioned therein.

The general object of the present invention is to improve the operation of welt sewing machines, and especially to improve the mode is of feeding, guiding and applying the welt.

Other and further advantageous features of the present invention will be pointed out in thehereinafter following description of an illustrative embodiment thereof or will be understoodto those conversant with the subject. V 1

To'the attainment of such ob ects an d advantages the present invention consists in the novel welt sewing machine,-jand welt handling mechanism, and novel features-of cornbination, arrangement, operation and structure herein illustrated. or described.

o In the accompanying drawings Fig. 1 is a right elevation of a suflicient partofa Reece welt sewing machine to illustrate connec tion with the other figures, the principles of Similar reference numbers are applied to corresponding parts in the several figuresof the drawings. p V V .7

Referring to the drawings Fig. lshows a shoe in sewing position Surrounding the last Z is the insole s with its outturned lip s,

the shoe upper u, and the welt'strip w being fed into place and attached by thread t to the upper and insole lip. 4 I

The'machine frame may comprise the usual tall post 9 at the upper end of which is a This invention relates to welt sewing machines and more especially to sewing ma'- chines known as the welt and turn machine, an example of which is the Reecewelter in Application filed March 31 1928i Serial No. 266,420.

suitable head orframe including'fore-and aft frame walls 10 and 11, being the .twousual' frame walls, and giving support to the mechanism of this'inv'ention. The stitching shaft 12 is shown as turning in the walls 10 and 11 along with other usual bearings. Thethread PATENT? a p AXEL'FOLKE CABLSON, or onmianlnen, MASSACHUSETTS, Assrenon roinnncnfisnon MACHINERY COMPANY, or nos'ron, MASSACHUSETTS, A conronnzrxo v'on MAINE. p

t usually comes from a waxpotat the rear, passing first to a thread whe'el13 around which the thread travels subject to there-FL} strainingaction of a tensioncontrolor'd-G, I

vice 14. From the tension of threadpasses i to'a take-up lever 15 and thence to the usual loop'er 16- operatedto apply a loop of the waxed thread to the barbed point of the needle 17 the needle thus applying successive stitches to the work, while, betweenstitc'hes the work is; fed forwardly by the usual re ciprocating feed point or device 18.

The shoe or work is shown as being held to position in contact against a bumper or work rest '19, which as usualmay beyielding during one portion of each stitch cycle,

but locked forwardly during the retraction ofthe needle. The work also bears against the welt guide 20 supported on" a movable:

carrier 21 fulcrumed forexample toswing about axle 22'supported in bearings 23 above the stitching point. The welt guide, likethe work rest, is intended to be held yieldinglyl forward to the workduring partof-each cycle, but lockedforward during thefretrae .tion of the needle. For thispurpose ajlink 26 is shown extending from the lowerend of the welt guide carrying lever 21 toza recipro-i eating slide 27 these parts being normally held yieldinglyforwardfby a strong spring 28, shown illustratively'as a platespring upstanding-from a fixed part of the machine.

frame In order to lock forwardly these parts during the retraction of the needle any well known locking means may be employed,

such as the wedging grip arm 30 correspond ing with that shown in Patent 1,599,431, this being operated througha link or other com nection 31 and allowed to d'rawnf rearwardlyinto' wedgin'g contact with the slide, at the proper points of time, by a spring 32; The work rest 19 nay have similar control as in saidpatentfj l 5 I "It is sometimes desirable to operatethe welt guide to have a slight rearward or retracting movement during each stitch cycle preferably immediately preceding the feeding period, the welt guide being retracted a short extent and then returned forwardly and restored to contact with the shoe as the feed motion ceases; this not merely reducing resistance and thus facilltatlng the feed movement, buttending also to advance the welt in operation for the-feed movement and supply it with minimum dragduring the feed movement. For this purpose the present invention shows the following novel and effective" mechanism. The overhead Iaxle 22 which carries the swinging welt guide carrier 21 1s shown as arock shaft supported 1n bearings 23. At a point considerably in advance of,

or to the right of, the welt guide carrier, the rock shaft 22 is shown as carrying a'rock arm 35, pinned to the shaft, and extending "upwardly to where, at its upper end, it is formed with'an' arc shaped flange 36 conceni trio with jthe'shaft 22. This are member or tending vertically to the right of the arc flange 3615 one memberof a device in the nature'of a pawl andratchet, without teeth but workingfby friction and gripping, the

other member, which may be termed the pawl 37 being shown as engaged with a snug fit on'the arc member, as best seen in Fig. 3, and having a corresponding conformatlon,

so that normally there may be free relative slidingof the arc memberthrough the pawl member during rocking movements ,of the rock shaft 22, The body of the pawl member 37 contacts at the underside of the arc member 36, while the. pawl member has an overlying extension '38 contacting the, upper sidegof. the arc member. ,As seen inlFig,;4;

the'underlying and overlying parts of. the pawl member are interconnected by metal exmember, and when assembled the parts may be-confined in their illustrated position by a guard" member or overhanging plate 39 attached to the portion 38 to the left ofthe arc memberpv e For the purposes of this invention the pawl member37 may besubstantially free or floatthe pawlmember rearwardly to the normal ing, without any fixed mounting, while a spring 40 is shown tending always to draw position indicated in Fig.1. In those parts 7 of the cycle when the pawl member is idle Y it is thus held rearward and inactive, while the are /member- 36 rocks freely forwardly and rearwardly' with the rockshaft carrying it.

7 At the'points in the cyclehowever when the weltguide is to be retracted the pawl member 37 becomes active and cooperates with the: arc member 36.to swing the rock lever 35 forwardly and thus ,swing rear wardly thewelt guide. For thepurpose of r r this'operation the pawl member 37 is'shown as having at its lower end a contact or head 41 adapted to be contacted and thrust forwardly by a finger or shoulder 42'extending upwardly from a sleeve 43 turning loosely on the axle 22. When the sleeve 43 is turned,

as will be described, in amanner to throw forwardly the finger 42, this contacts and throws forwardly the contact head 41of'the pawl member 37. The immediate effect of the pressureof 42 vagainst 41 is the gripping I of the arc member 36- by the pawl member."

This action will be understoodfrom Fig. 3. The gripping is instantaneous and powerful. The consequence is that the continued forward movement of the finger 42 causes the forward swinging ofthe pawl member 37, the arc member 36 and the rock arm 35 carrying the latter. This rocks the axle 22 and retracts the weltguideffor a proper distance, asdescribed.

The rotating ofthesleeve 43 for these pur poses maybe effected automatically bythe: followingconnections. Integral with the loose sleeve 43 is an upstanding rock arm 44 and at the upper end .of this rockarm is a pivot 45, adjustable to vary the throw,'con

nected by a rod46 with a guide arm47 havmg a fixedfulcrum48on the frame wall 11, the connecting rod having a cam stud or follower 49 running in a cam groove 50 of acam 7 disk 51 mounted on ing shaft 12. H

f The parts are shown in the position at whlch the retraction of the welt guideis very shortlyto occur, the stitchin shaft turning the; operating or stitchcounterclockwise in Fig. 1. y the inclined cam portion 52 the connecting rod 46 is" thrown forward and this throws .forwardly the rock ar1n-44Cand thevcontact finger-L42,

which inturnoperates, through the pawl andratchet device, as described, to draw:-rear wardly the weltrguide; following which the cam portion 1 53 comes into effect to bring about a smooth easy return of the parts to normal; audit will be seen that in normal position the pawl actuating finger 42 is slightly I out of Contact with the pawl head 41, so

that the pawl is infloating condition, held 35, from whichthe welt guide .takes. its re-i tracting motion, the concentric arc piece f 36 which rocks with the said rock member, a

gripping member37 engaging or embracing slidingly the arc piece, and-timed means, the finger 42 along with its connections from the stitching shaft =arranged to thrust on said grip member so as to causeit to grip the are which may be the carrierv 21, shaft 22 or arm piece and thereby retract the welt guide in each stitch cycle. 7

There has thus beendescribed a welt sewing machine embodying a welt guiding device constructed and operating in accordance with the principles of the present invention. Since many matters of-combination, arrangement, operation and structure may be variously modified without departing from'the principles of the invention, it is not intended to limit the invention to such matters except to the extent set forth in the appended claims. IVhat is claimed is: 1. In a welt sewing machine having means for feeding the work and for stitching the Welt thereto, a welt guide mounted for movement transversely of the feed, and means for causing the retraction of the welt guide from the Work in each stitch'cycle and its return to the work, comprising a rock member through which the welt guide is given its retracting motion, a concentric arc piece rocking with said rock member, a rigid grip member having opposite portions engaging slidingly with the outer and inner sides of said are piece, and timed means to thruston said grip member to cause it to tilt and therebyvgrip the arc piece and thereupon rock the arc piece and rock member. 2. In a welt sewing machine having means for feeding the work and for stitching the welt thereto, a welt guide mounted for movement transversely of the feed, and means for causing the retraction of the welt guide from the work in each stitch cycle and its return to the work, comprising a rock member through which the welt guide is given its retracting motion, a concentric arc piece rocking with said rock member, a grip member .slidable freely upon said are piece,.a stop for sion extending radially toa point removed from the arc piece, said extension adapted to be pressed by the thrusting means to cause 7 ing an operating extension, and. timed means for pressing said extension to cause the grip member to grip the arc piece and rock it, thereby to retract the welt guide in each stitch cycle.

5. A machine as in claim 4 and wherein the grip member extension extends toward the axis of rocking, and the means for pressing it consists ina concentric member rotatable on said axis with a thrusting part normally inoperative but adapted to be rotated to contact the extension for gripping and rocking purposes.

In testimony whereof, I have aflixed my signature hereto.

AXEL F. CARLSON.

the normal position of the grip member, a

spring restraining the grip member and pressing it retractingly to the stop and timed means to thrust on said grip member to cause it to grip and rock the arc piece and thereby to retract the welt guide in each stitch cycle.

3. In a welt sewing machine having means for feeding the work and for stitchingthe welt thereto, a welt guide mounted for movement transversely of the feed, and means for causing the retraction of the welt guide from the work in each stitch cycle and its return to the work, comprising a rock member through which the welt guide is given its retracting motion, a concentric arc piece rocking with said rock member, a grip member engaging slidingly with said are piece, the grip member normally occupying a retracted position, timed means to thrust on said grip member to cause it to grip and rock the are 

